Ask HN: How to overcome the feeling that everything has already been done?

I remember clearly that when I first built a "site" in Front Page (maybe in '98) I thought to myself: "ONCE I REALLY LEARN THIS I CAN DO ANYTHING!!!111".

15 years later and I'm a web developer with a lot of free time looking for any opportunities, and I just can't get myself to build anything, because every single idea seems to be already done.

I know people used to say this decades ago, and I know there's always room for innovation, or improving existing things, etc. But I just can't get motivated enough.

Any tips for getting excited about projects, knowing that there's a 99% chance the thing you are working on have already been built or is currently being developed in a much better way for at least other 30 companies?

Any books or articles related to this are welcome.